256435643604 has 48 divisors (see below), whose sum is σ = 683862270336. Its totient is φ = 73263696000.

The previous prime is 256435643593. The next prime is 256435643623. The reversal of 256435643604 is 406346534652.

256435643604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256435643604² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1950754 + ... + 2078054.

It is an arithmetic number, because the mean of its divisors is an integer number (14247130632).

Almost surely, 2^256435643604 is an apocalyptic number.

It is an amenable number.

256435643604 is an abundant number, since it is smaller than the sum of its proper divisors (427426626732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256435643604 is a wasteful number, since it uses less digits than its factorization.

256435643604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151296 (or 151294 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 48.

The spelling of 256435643604 in words is "two hundred fifty-six billion, four hundred thirty-five million, six hundred forty-three thousand, six hundred four".